6kA MCB – 50A 1 Pole C Curve (WMC150C)
£1.84
£2.99
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
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The WMC150C is a 50 A single-pole 6 kA Miniature Circuit Breaker (MCB) providing reliable overcurrent and short-circuit protection for feed circuits, plant equipment and sub-boards with moderate-to-high inrush currents. Its C-curve tripping characteristic (5–10 × In) handles motor and transformer surges without nuisance tripping while ensuring rapid fault clearing...
The WMC150C is a 50 A single-pole 6 kA Miniature Circuit Breaker (MCB) providing reliable overcurrent and short-circuit protection for feed circuits, plant equipment and sub-boards with moderate-to-high inrush currents. Its C-curve tripping characteristic (5–10 × In) handles motor and transformer surges without nuisance tripping while ensuring rapid fault clearing under BS 7671.
Tested to BS EN 60898 and compatible with Whitecliffe consumer units, the WMC150C delivers a 6 kA breaking capacity and 20 000-cycle mechanical life. Ideal for domestic or light-industrial feed and distribution circuits requiring robust inrush-resilient protection.
Installer Tip: Select C-curve breakers for circuits feeding motors or plant equipment. Confirm Zs, cable sizing and protective coordination with upstream devices to meet BS 7671 disconnection times.
- 50 A rated current with C-curve (5–10 × In) tripping profile
- 6 kA breaking capacity at 230/400 V AC
- Single-pole design – 18 mm module width
- DIN-rail mounted for consumer units and distribution boards
- Complies with BS EN 60898 and BS 7671 (18th Edition A2)
- Service life – 20 000 mechanical / 8 000 electrical operations
| Part Code | Rating | Curve | Typical Use |
|---|---|---|---|
| WMC140C | 40 A | C | Sub-mains and plant feeds |
| WMC150C | 50 A | C | Feed and equipment circuits with high inrush |
| WMC163C | 63 A | C | Distribution and plant circuits with heavy load demand |
The WMC150C provides 6 kA protection for feed and plant circuits in domestic and light-industrial environments. For resistive loads use a B Curve MCB, or choose Type A RCBOs to add earth-fault protection.
Where is a 50 A C Curve MCB used?
Typically on feed circuits or plant equipment with motors or transformers that draw higher startup currents.
Is the WMC150C compatible with Whitecliffe boards?
Yes – it fits all Whitecliffe consumer units and standard DIN-rail enclosures.
Can this breaker feed a sub-board or industrial machine?
Yes, provided the fault level does not exceed 6 kA and the cables are rated for the load. For higher fault environments, see our 10 kA MCBs.
What does C Curve mean on an MCB?
It trips between 5–10 × the rated current (In), making it ideal for circuits with motors or transformers that produce brief inrush currents.
Do you supply D Curve versions?
Yes – Type D (10–20 × In) devices are available on request for industrial loads with very high inrush currents.
- Part Code: WMC150C
- Type: Single Pole MCB
- Rated Current (In): 50 A
- Curve: C (5–10 × In tripping characteristic)
- Rated Voltage (Ue): 230/400 V AC
- Rated Frequency: 50/60 Hz
- Breaking Capacity (Icn): 6 kA
- Insulation Voltage (Ui): 500 V
- Impulse Withstand (Uimp): 4 kV
- Dielectric Test Voltage: 2 kV for 1 minute
- Thermal Reference Temp: 30 °C
- Operating Temperature: –5 °C to +40 °C (avg < 35 °C)
- Mechanical Life: 20 000 operations
- Electrical Life: 8 000 operations
- Mounting: 35 mm DIN rail (1 module width)
- Standards: BS EN 60898; BS 7671:2018 (Amendment 2)
- Typical Applications: Feed and plant equipment circuits, sub-boards and distribution feeds with moderate-to-high inrush
Install the WMC150C in a suitable consumer unit or distribution board by a qualified electrician. Match the MCB rating and curve to the circuit design and expected load.
- Mount securely on 35 mm DIN rail and ensure busbar alignment
- Use C-curve for motors, compressors and feed circuits with inrush
- Check Zs and voltage drop against BS 7671 limits
- Tighten terminals to manufacturer torque values and log test results
